Using Synechocystis sp. as a model, the group succeeded to increase PHB formation 2,5 fold upon overexpressing sigma factor SigE under nitrogen starvation.
Takashi OSANAI et al., DNA Research July 16, 2013, doi: 10.1093/dnares/dst028
RIKEN team obtains 2,5-fold increase of PHB in cyanobacteria upon enhancing SigE control factor